【预告】“物理学前沿”学术报告 | 吴从军教授：Unification of orbital-active ...

报告直播二维码

此次讲座由Frontiers of Physics编辑部，高教社自然科技期刊中心主办，于2020年8月5日10:00开始，授权蔻享学术进行网络直播。

主题：Unification of orbital-active honeycomb materials

主讲人：吴从军教授（University of California, San Diego）

主持人：周树云教授 （清华大学）

时间：2020.8.5（周三）10:00-11:30
主办方：Frontiers of Physics编辑部，高教社自然科技期刊中心

报告摘要

Based on the symmetry principle, we provide a unified view on a class of orbital-active honeycomb materials. They possess a pair of degenerate orbitals on each site forming the 2D (E-) representation of the D₃, or, C_3v  point group symmetry.  We found the same principle applies to a variety of solid state systems including the p_x and p_y orbitals of bismuthene, stanene, the exciton-polariton lattice, and the d_(x2-y2) and d_(r2-3z2)-orbitals in transition-metal oxide layers, and also the ultra-cold atom optical lattices. I will explain that the recent focus of the twisted bilayer graphene is a particular example to manifest this symmetry. Such a unified view brings a variety of interesting properties, including the strong correlation physics of Wigner crystallization and ferromagnetism inside flat bands, interaction induced spontaneous quantum anomalous Hall states, and the orbital-assisted f-wave superconductivity. We also propose a new mechanism to boost the topological gap to the full scale of atomic spin-orbit coupling, which can reach the order of1eV and has been recently realized in bismuthene on the substrate of SiC. In the Mott-insulating states, the orbital exchange is heavily frustrated as described by a novel quantum 120 deg. model -- a cousin of the Kitaev model, whose classic ground state problem maps to the fully packed loop model in the honeycomb lattice. The “order from disorder” study is performed to analyze its quantum ground state ordering. 

主讲人介绍

Congjun Wu received his Ph.D. in physics from Stanford University in 2005, and did his postdoctoral research at the Kavli Institute for Theoretical Physics, University of California, Santa Barbara, from 2005 to 2007. He became an Assistant Professor in the Department of Physics at the University of California, San Diego (UCSD) in 2007, an Associate Professor of Physics at UCSD in 2011, and a Professor of Physics at UCSD in 2017. He was elected to be a Fellow of American Physical Society in 2018. His research interests are exploring new states of matter and reveling their organizing principles, including quantum magnetism, superconductivity, topological states, mathematical physics, and the numerical method of quantum Monte Carlo simulations.

Frontiers of Physics (FOP, IF 2.502)是由教育部发起、高教社出版、Springer海外发行的Frontiers系列英文学术期刊之一，其宗旨是报道国际物理学领域的最新成果和研究进展，突出前沿成果、热点问题和交叉点，主要发表Topical Review, Review, Research Article, 也委托专家组织特定主题的前沿专题。现任总主编：赵光达院士；执行主编：李定平教授；主编：龙桂鲁教授（量子计算与量子信息）、张卫平教授（AMO）、王楠林教授（凝聚态与材料物理）、李海波教授（核物理/粒子物理/天体物理与宇宙学）。期刊已被SCI, JCR, ADS, SCOPUS, INSPEC, Google Scholar, CSCI, CSCD等收录。2013-2018入选中国科技期刊提升计划资助项目，2019年入选中国科技期刊卓越行动计划资助项目。详细请扫描关注：

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